Basic Minimum Allowable Clearance of Wires from Other Wires at Crossings
and at Supports
(Letter references Denote Modifications of Minimum Clearances Referred
to in Notes Following this Table)
All Clearances Are in Inches

Case No.

Nature of Clearance and Class of Voltage of wire,
cable or conductor concerned

1. Conductors not supported on the same poles
54.4-C7a
2. Conductors supported on the same crossarm, pole or structure.
54.4-C7b

(h) May be reduced for certain conductors of Class T
circuits of the same system 74.4-C

(i) May be reduced for service drops under
special conditions.

1. Supply service drops and communication line
conductors 54.8-C1a
2. Supply service drops and communication service drops 54.8-C4
3. Communication service drops and supply line conductors 84.8-D1a
4. Communication service drops and supply service drops
84.8-D4

(j) May be reduced or shall be increased for certain
communication conductors or cables.

1. Open
wire conductors, attached to poles, within 3 feet of topmost conductor 84.4-C1c
2. Line conductors
of police or fire-alarm circuits and service drops from other communication
circuits. 84.8-D1b
3. Cables and messengers
attached to poles 87.4-C3

(k) Special clearances for 0-750 volt conductors
in rack configuration and messengers and cables attached to poles.

(n) May be reduced for supply conductors and private
communication conductors of the same ownership 89.2-B

(o) May be reduced or increased for triangular or vertical
configuration or for pole-top construction.

1. Triangular or vertical configuration
on crossarms 54.4-C1c
2. Dead-ended on pole in vertical configuration 54.4-C4
3. Conductors of 0-7500 volts in triangular configuration at top
of pole 54.4-D8a
4. Conductors of more than 7500 volts at top of pole
54.4-D8b

(p) May be reduced for supply service drops of 0-750
volts 54.8-C6

(q) Shall be increased between circuits where conductors
of more than 7500 volts are at pole top. 54.4-D8b

Basic Minimum Allowable Clearance of Wires from Other Wires at Crossings
and at Supports
(Letter references Denote Modifications of Minimum Clearances Referred
to in Notes Following this Table)
All Clearances Are in Inches

Case
No.

Nature
of Clearance and Class of Voltage of wire, cable or conductor concerned

1. Conductors
not supported on the same poles 54.4-C7a
2. Conductors supported on the same crossarm, pole or structure.
54.4-C7b

(h) May be reduced for certain conductors of Class
T circuits of the same system 74.4-C

(i)
May be reduced for service drops under special conditions.

1. Supply
service drops and communication line conductors 54.8-C1a
2. Supply service drops and communication service drops 54.8-C4
3. Communication service drops and supply line conductors 84.8-D1a
4. Communication service drops and supply service drops
84.8-D4

(j) May be reduced or shall be increased for certain
communication conductors or cables.

1.
Open wire conductors, attached to poles, within 3 feet of topmost conductor
84.4-C1c
2. Line conductors
of police or fire-alarm circuits and service drops from other communication
circuits. 84.8-D1b
3. Cables and messengers
attached to poles 87.4-C3

(k)
Special clearances for 0-750 volt conductors in rack configuration and messengers
and cables attached to poles.

(n) May be reduced for supply conductors and private
communication conductors of the same ownership 89.2-B

(o) May be reduced or increased for triangular or vertical
configuration or for pole-top construction.

1.
Triangular or vertical configuration on crossarms 54.4-C1c
2. Dead-ended on pole in vertical configuration 54.4-C4
3. Conductors of 0-7500 volts in triangular configuration at top
of pole 54.4-D8a
4. Conductors of more than 7500 volts at top of pole
54.4-D8b

(p) May be reduced for supply service drops of 0-750
volts 54.8-C6

(q) Shall be increased between circuits where conductors
of more than 7500 volts are at pole top. 54.4-D8b

Basic Minimum Allowable Clearance of Wires from Other Wires at Crossings
and at Supports
(Letter references Denote Modifications of Minimum Clearances Referred
to in Notes Following this Table)
All Clearances Are in Inches

Case No.

Nature of Clearance and Class of Voltage of wire, cable or conductor concerned

1. Conductors not supported on the same poles
54.4-C7a
2. Conductors supported on the same crossarm, pole or structure.
54.4-C7b

(h) May be reduced for certain conductors of Class T circuits
of the same system 74.4-C

(i) May be reduced for service drops under special conditions.

1. Supply service drops and communication line
conductors 54.8-C1a
2. Supply service drops and communication service drops 54.8-C4
3. Communication service drops and supply line conductors 84.8-D1a
4. Communication service drops and supply service drops
84.8-D4

(j) May be reduced or shall be increased for certain communication
conductors or cables.

1. Open wire conductors, attached to poles, within 3 feet of topmost
conductor 84.4-C1c
2. Line conductors of police or fire-alarm circuits and service drops
from other communication circuits. 84.8-D1b
3. Cables and messengers attached to poles 87.4-C3

(k) Special clearances for 0-750 volt conductors in rack
configuration and messengers and cables attached to poles.

(n) May be reduced for supply conductors and private communication
conductors of the same ownership 89.2-B

(o) May be reduced or increased for triangular or vertical
configuration or for pole-top construction.

1. Triangular or vertical configuration
on crossarms 54.4-C1c
2. Dead-ended on pole in vertical configuration 54.4-C4
3. Conductors of 0-7500 volts in triangular configuration at top of
pole 54.4-D8a4. Conductors of more than 7500 volts at top of pole 54.4-D8b